A Coupled Inductor And Switched-capacitor Non-isolation High Step-up Boost Converter

In recent years,due to the gradual exhaustion of fossil fuels such as coal and oil,and serious environmental problems,clean new energy,such as solar energy,wind power and fuel cell,has attracted more and more attention.However,the output voltage is lower and the range of variation is larger in these renewable energy generation systems,which can't be transmitted directly to the power grid system as traditional power generation models such as coal-fired power generation and hydropower generation.Therefore,the output voltage of the new energy system needs to be processed and raised to a high enough level by DC/DC converter,and the power will be supplied to the grid for power generation or local load by DC/AC converter.So it is of great significance to study the high gain DC/DC converter for the development of energy industry.There are the characteristics of good boosting effect,easy to control and diversified structure in coupled inductor(CI)boost converter topology.The coupled inductor only processes part of the input energy,and the other input energy is transferred to the output terminal through the converter,which is reducing the dependence on the transformer and the winding number and the loss on the transformer.But the energy of the leakage is not transmitted to the output terminal through the coupled inductor and it can only be released through the switch tube,which produces high voltage peak when the power MOSFET is shut off,and even affects working characteristics of the converter.In general,the energy of leakage is transferred by adding a passive or active clamping circuit,which can be used to switch off the voltage spike,but this increases the complexity of the converter structure and control.In this paper,a coupled inductor and switched-capacitor non-isolation(CISC)DC/DC booster converter is proposed and studied.In this converter,the leakage energy does not require an additional clamping circuit to be recycled.In this paper,a detailed working state analysis of the converter is carried out.The main parameters working waveform and the equivalent circuit diagram of each switch mode are given.By analyzing the steady state performance,voltage gain and power switch tube,diode equation of the voltage stress are derived and the converter is compared with the existing coupled inductance converter with analysis.The research shows that the proposed converter topology has high voltage gain and low switching stress.In this paper,the appropriate component parameters are designed,and the simulation circuit of the converter is built in MATLAB/Simulink simulation software,and verify the feasibility of the topology structure of the converter by Analyzing the simulation waveform.The hardware design of the suitable coupled-inductor and inductor is selected,and the prototype of high-gain converter based on FPGA is set up,and the corresponding experiment is carried out.The correctness of theoretical analysis is verified by the analysis of simulation and experiment results.